NOUVELLE METHODE DE LUTTE CONTRE LA PUCE DE TERRE DANS LA CULTURE DU CANOLA

NEW METHOD FOR THE CONTROL OF FLEA BEETLES IN CANOLA

Abrégé français

Une méthode de protection d'une plante sensible aux attaques d'un insecte Phylotxeta spp. de ladite attaque, ladite méthode comprenant l'application à la graine dont pousse la plante d'une quantité efficace d'un insecticide chloronicotinyl ou d'un sel de celui-ci, lequel insecticide étant autre que l'imidaclopride et le thiaméthoxame.

Abrégé anglais

A method of protecting a plant susceptible to attack by a Phylotxeta spp. insect from said attack which comprises applying to the seed from which the plant grows an effective amount of a chloronicotinyl insecticide or a salt thereof, which insecticide is other than imidacloprid and thiamethoxam.

Revendications

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CLAIMS:
1. A method of protecting a plant susceptible to attack by a Phyllotreta spp.
insect
from said attack which comprises applying to the seed from which the plant
grows an
effective amount of a chloronicotinyl insecticide or a salt thereof, which
insecticide is other
than imidacloprid and thiaxamethoxam.
2. The method according to Claim 1 wherein the plant is a Brassiea spp. plant.
3. The method according to Claim 2 wherein the Brassiea spp. plant is selected
from
the group consisting of Brassica napus, Brassica raps, and Brassica juncea.
4. The method according to Claim 1, 2 or 3 wherein the Phyllotreta spp. is
Phyllotreta
cruciferae.
5. The method according to any one of Claims 1-4 wherein the plant cotyledon
has
expanded.
6. The method according to any one of Claims 1-3 wherein the plant is
protected from
the time of emergence from the seed from which it grows to flowering of the
plant.
7. The method according any one of Claims 1-6 wherein the plant is at a growth
stage
of from the expansion of the plant cotyledon to the sixth true leaf.
8. The method according to any one of Claims 1-7 wherein the insecticide is
applied
to the seed in an amount of from 0.1 g per kg of seed to 20 g per kg of seed.
9. The method according to any one of Claims 1-7 wherein the insecticide is
applied
to the seed in an amount of from 1 g per kg of seed to 10 g per kg of seed.

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10. The method according to any one of Claims 1-7 wherein the insecticide is
applied
to the seed in an amount of from 2.5 g per kg of seed to 7.5 g per kg of seed.
11. The method according to any one of Claims 1-10 wherein the insecticide is
(E)-N1-[(6-chloro-3-pyridyl)methyl]-N2-cyano-N1-methylacetamidine.

Description

CA 02244580 1998-08-04
New Method for the Control of Flea Beetles in Canola
The present invention relates to a new method fox the control of flea beetles
in
plants.
At the present tune, there exists a need to protect plants from infestation
and
damage by flea beetles. This particular problem exists in portions of the
North
American continent where canola is raised for the value of its oil. At present
there is
no one-stage chemical treatment effective to protect canola from the damage
that is
done by flea beetles. In fact, a generally accepted method comprises treating
canola
seed with lindane (a mixture of 1,2,3,4,5,6-hexachlorocyclohexanes), combining
with
granular terbufos (S-tert-butylthiomethyl O,O-diethyl phosphorodithioate) and
then
planting the seed/pesticide cotnpositiozt. It is generally known that lindane
and other
chlorinated hydrocarbon iuasecticides (as well as organophosphates )are being
removed
from agrochemical markets on a worldwide basis due their generally
unacceptable
persistency in the soil or acute toxicity to mammals. Thus there exists a need
for an
improved treatment of canola from flea beetle attack.
An object of the present invention is to provide a new insecticidal treatment
of
canola seed.
Another object of the preseat invention is to provide a one-stage or one-step
treatment of canoia for protection from flea beetle
Another object of the present invention is to provide a treatment of canola
seed
that is more environmentally acceptable thazt the state of the an.
Another object of the invention is to provide a treatment of canola seed that
is
superior to those in the state of the art.
These objects are roet in whole or in part by the present invention.
The present invention provides a method of protecting a plant susceptible to
attack by a Phylotreta spp. insect from said attack which comprises applying
to the
seed from which the plant grows an effective amount of a chloronicotinyl
insecticide
or a salt thereof, which insecticide is other than itxtidaeloprid and
thiamethoxam.
34 Preferably the insecticide is (E)-N~-[(6-chloro-3-pyridyl)methyl]-N~-cyano-
N~
methylacetamidine (acetamiprid or NI-25) The preparation and general uses of
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CA 02244580 1998-08-04
acetatz~,iprid are described in US Patent 5,304,566 and in The Pesticide
T~lanual, 10'"
edition, Ed. C. Tomlin, British Crop Protection Council, 1994, p.730.
Generally the Phyllotreta spp. is Phyllotreta cruciferae, which may also be
known as turnip fly, ctucifer flea beetle, or cabbage flea beetle. Generally
the plant is
a Brassica spp. plant. Preferably the Brassica plant is Brassica napes ( also
known as
Rape or Rapeseed) , Brassica rapa (also known as canola), or Brassica juncea
(mustard).
The method preferably comprises protecting the plant from the time of
etrtergence from the seed from which it grows to flowering of the plant. This
is
generally the period during which the plant is susceptible to attack by
Phyllotreta.
Preferably, the plant is at a growth stage of from the expansion of the plant
cotyledon
to the sixth true leaf. Preferably the plant cotyledon has expanded.
In general the insecticide is applied to the seed in an amount of active
ingredient of fxom 0.1 to 20 grams per kg of seed (g/kg), preferably from 1 to
10 glkg
and most preferably from 2.5 to 7.5 g/kg.
The seed treatment step is effected by conventional means of seed treatment
known to those skilled in the art of seed treatment.
The present iztvention also provides a method of treating seed to protect the
plant from which it grows, the said method cozxaprisiztg applying to the said
seed an
insectieidally effective amount of a ehloronieotinyl insecticide or a
composition
comprising the insecticide, which insecticide is other than imidacloprid or
thiamethoxam.
The invention also provides the seed so treated by the said method of
treatment.
The following non-limiting example provides an example of the invention.
EXAMPLE 1
Acetamiprid is applied to canola seed at rates of 7.5, 10, and 12.5 grams of
active ingredient per kg of seed. Imidacloprid is applied to carxola seed at
rate of
15g/kg of seed. The seed is planted and allowed to grow. At 4, 7, 10 and 14
days post
emergence of the plant, damage is assessed for the plants by lookizag for shot-
hole
damage. All treatments of acetamiprid provide substantially more control than
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CA 02244580 1998-08-04
imidacloprid and are generally eduivalent to the two stage lindane + terbufos
treatment. At the end of the growing season, there is a general yield increase
in plants
which are grown from seed that bas been treated by acetamiprid,
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